Add smp support to RT-Thread 4.0

src/clock.c

@@ -12,12 +12,17 @@
  * 2010-05-20     Bernard      fix the tick exceeds the maximum limits
  * 2010-07-13     Bernard      fix rt_tick_from_millisecond issue found by kuronca
  * 2011-06-26     Bernard      add rt_tick_set function.
+ * 2018-11-22     Jesven       add per cpu tick
  */
 
 #include <rthw.h>
 #include <rtthread.h>
 
+#ifdef RT_USING_SMP
+#define rt_tick rt_cpu_index(0)->tick
+#else
 static rt_tick_t rt_tick = 0;
+#endif
 
 extern void rt_timer_check(void);
 
@@ -71,7 +76,11 @@ void rt_tick_increase(void)
     struct rt_thread *thread;
 
     /* increase the global tick */
+#ifdef RT_USING_SMP
+    rt_cpu_self()->tick ++;
+#else
     ++ rt_tick;
+#endif
 
     /* check time slice */
     thread = rt_thread_self();